Soylent Green

New York City, 2022 AD, population 40,000,000. Pollution has created constant heatwaves and food shortages. Whole foods are unavailable except to the very rich -- the populace survives on concentrated food proteins, available in varieties such as Soylent Red, Soylent Yellow and Soylent Green.

The videogame in Simonson's apartment, "ComputerSpace", was one of the first coin-operated videogames, manufactured by Nutting Associates in 1971 and designed by Nolan Bushnell, who later founded Atari and designed "Pong."

One set of scenes in the original release, where a second family is housed with Thorne and Roth, was deleted from later copies of the film.

Coincidentally, the director's surname, Fleischer, is German for "butcher."

Apparently Richard Fleischer and crew didn't think forcing the entire population of the world to eat soy products was scary enough of a proposition, so they decided to throw in a little cannibalism for good measure.